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2016, 35(1) 28-39 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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LA- ICP- - MS zircon U- Pb dating and geochemical characteristics of volcano clastic rocks in Gu’antun Formation of Yimianpo of Shangzhi��Heilongjiang Province |
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SUN Xiao, GUO Zhii-Tao, DOU Lu-Wen, ZHOU Jing, YU Hong-Chao, LIANG Yi-Hong |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Land and ��esources Bureau of Chinan District��Management Committee of Changbai Mountain Protection and Development Zone��Jilin Province��Manjiang 134512��Jilin China; 3. Geological Exploration Institute of Shandong Zhengyuan��Jinan 250101��China |
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Abstract��
Zircon U- Pb ages and geochemical characteristics of crystal tuff intercalated in sandstone and slate in Gu’antun Formation of Yimianpo of Shangzhi�� Heilongjiang Province were determined�� The crystal tuff is main- ly dacitic and rhyolitic in nature��and contains SiO 2 (63. 43% ��75. 01%)��belonging to calc- alkaline series and high- K calc- alkaline series�� Trace elements of the crystal tuff are characterized by the enrichment of ��b��K��and depleted in Sr�� The ��EE patterns demonstrate strong enrichment in L��EE and depletion in H��EE��and negative a- nomaly in Eu�� They have the characteristics of magmatic component from volcanic arc�� Zircon U- - Pb isotopic dating is 258. 0 ±1. 6 Ma (MSWD =0. 113)��which represents the forming age of the crystal tuff in the Gu’antun For- mation as the Late Permian�� |
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Keywords��
Guantun Formation
crystal tuff
zircon U-Pb dating
geochemistry
Yimianpo of Shang- zhi
Heilongjiang Province
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